PETROCHEMICAL
STUDBOLTS
Finished studbolts and studbolt assemblies are available from stock in both Imperial and Metric threads and in a range of different finishes. Our studbolts are widely used in the Petrochemical industry and are covered in the ASTM standards A193 for high temperature or high pressure service, and A320 for low temperature service. A selection of the most commonly used studbolt materials are listed in the table below. For the full list of materials available please see our materials section above.
| GRADE | MATERIAL DESCRIPTION |
|---|---|
| A193 B7, B7M | Chromium-Molybdenum, Alloy Steel, AISI 4140 |
| A193 B16 | Chromium-Molybdenum-Vanadium, Alloy Steel |
| A193 B8 | Type 304 Stainless Steel, Carbide Solution Treated |
| A193 B8 Class 2 | Type 304 Stainless Steel, Carbide Solution Treated, Strain Hardened |
| A193 B8M | Type 316 Stainless Steel, Carbide Solution Treated |
| A193 B8M Class 2 | Type 316 Stainless Steel, Carbide Solution Treated, Strain Hardened |
| A320 L7, L7M | Chromium-Molybdenum, Alloy Steel, AISI 4140, Low Temperature Service |
GRADE
Material
Chromium-Molybdenum, Alloy Steel, AISI 4140
Material
Chromium-Molybdenum-Vanadium, Alloy Steel
Material
Type 304 Stainless Steel, Carbide Solution Treated
Material
Type 304 Stainless Steel, Carbide Solution Treated, Strain Hardened
Material
Type 316 Stainless Steel, Carbide Solution Treated
Material
Type 316 Stainless Steel, Carbide Solution Treated, Strain Hardened
Material
Chromium-Molybdenum, Alloy Steel, AISI 4140, Low Temperature Service
IMPERIAL - ANSI B16.5
DIAMETER (D)
| DIAMETER (D) | DIAMETER (D) | TPI (UNC) | TPI (UNS) |
|---|---|---|---|
| 1/4" | 0.250 | 20 | - |
| 5/16" | 0.313 | 18 | - |
| 3/8" | 0.375 | 16 | - |
| 7/16" | 0.438 | 14 | - |
| 1/2" | 0.500 | 13 | - |
| 9/16" | 0.563 | 12 | - |
| 5/8" | 0.625 | 11 | - |
| 3/4" | 0.750 | 10 | - |
| 7/8" | 0.875 | 9 | - |
| 1" | 1.000 | 8 | 8 |
| 1.1/8" | 1.125 | 7 | 8 |
| 1.1/4" | 1.250 | 7 | 8 |
| 1.3/8" | 1.375 | 6 | 8 |
| 1.1/2" | 1.500 | 6 | 8 |
| 1.5/8" | 1.625 | - | 8 |
| 1.3/4" | 1.750 | 5 | 8 |
| 1.7/8" | 1.875 | - | 8 |
| 2" | 2.000 | 4.5 | 8 |
| 2.1/4" | 2.250 | 4.5 | 8 |
| 2.1/2" | 2.500 | 4 | 8 |
| 2.3/4" | 2.750 | 4 | 8 |
| 3" | 3.000 | 4 | 8 |
| 3.1/4" | 3.250 | 4 | 8 |
| 3.1/2" | 3.500 | 4 | 8 |
| 3.3/4" | 3.750 | 4 | 8 |
| 4" | 4.000 | 4 | 8 |
The length (L), measured parallel to the axis, is the distance from first thread to first thread
End points are flat and chamfered both ends
Length of point on studbolts shall be not less than one nor more than two complete threads as measured from the extreme end parallel to the axis
Threads are UNC for all studbolt diameters 1” and smaller
Threads are UNS for all studbolt diameters 1.1/8” and above. These can be supplied as UNC but are non-standard.
Threads are Class 2A for all studbolts in accordance with ASME B1.1
METRIC - DIN976
| DIAMETER (D) | THREAD PITCH | DIAMETER (D) | THREAD PITCH |
|---|---|---|---|
| M6 | 1.00 | M36 | 4.00 |
| M8 | 1.25 | M39 | 4.00 |
| M10 | 1.50 | M42 | 4.50 |
| M12 | 1.75 | M45 | 4.50 |
| M14 | 2.00 | M48 | 5.00 |
| M16 | 2.00 | M52 | 5.00 |
| M18 | 2.50 | M56 | 5.50 |
| M20 | 2.50 | M64 | 6.00 |
| M22 | 2.50 | M72 | 6.00 |
| M24 | 3.00 | M76 | 6.00 |
| M27 | 3.00 | M80 | 6.00 |
| M30 | 3.50 | M90 | 6.00 |
| M33 | 3.50 | M100 | 6.00 |
THREAD PITCH
M6−
Thread Pitch1.00
M8+
Thread Pitch1.25
M10+
Thread Pitch1.50
M12+
Thread Pitch1.75
M14+
Thread Pitch2.00
M16+
Thread Pitch2.00
M18+
Thread Pitch2.50
M20+
Thread Pitch2.50
M22+
Thread Pitch2.50
M24+
Thread Pitch3.00
M27+
Thread Pitch3.00
M30+
Thread Pitch3.50
M33+
Thread Pitch3.50
M36+
Thread Pitch4.00
M39+
Thread Pitch4.00
M42+
Thread Pitch4.50
M45+
Thread Pitch4.50
M48+
Thread Pitch5.00
M52+
Thread Pitch5.00
M56+
Thread Pitch5.50
M64+
Thread Pitch6.00
M72+
Thread Pitch6.00
M76+
Thread Pitch6.00
M80+
Thread Pitch6.00
M90+
Thread Pitch6.00
M100+
Thread Pitch6.00
The length (L), measured parallel to the axis, is the distance from end to end
End points are flat and chamfered both ends
Length of point on studbolts shall be not less than one nor more than two complete threads as measured from the extreme end parallel to the axis
Threads are accordance with ISO 261